President Moon Jae-in speaks at the 50th Korea National Prayer Breakfast on Thursday, March 8, at KINTEX. (Yonhap)

"It appears that this has been influenced by the achievements made by President Moon's special envoys during their visit to North Korea, including an agreement to hold an inter-Korean summit," Gallup Korea said.

During the meeting with the South's envoys Monday, the North's leader agreed to hold a summit with Moon in late April, expressed a willingness to hold denuclearization talks with the U.S. and offered to suspend nuclear and missile tests while talks are under way.

In Washington, South Korea's national security adviser Chung Eui-yong, who led the delegation to the North, told reporters that Kim also offered to meet with U.S. President Trump as soon as possible, and Trump agreed to do so by May to achieve permanent denuclearization. (Yonhap)